Java加密技术(四) - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-23
itSign(priKey); signature.update(data); return encryptBASE64(signature.sign()); } /** * 丕刮方忖禰兆 * * @param data * 紗畜方象 * @param publicKey * 巷埒 * @param sign * 方忖禰兆 * * @return 丕刮撹孔卦指true 払移卦指false * @throws Exception * */ public static boolean verify(byte[] data, String publicKey, String sign) throws Exception { // 盾畜喇base64園鷹議巷埒 byte[] keyBytes = decryptBASE64(publicKey); // 更夛X509EncodedKeySpec斤? X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); // KEY_ALGORITHM 峺協議紗畜麻隈 KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); // 函巷埒革斤? PublicKey pubKey = keyFactory.generatePublic(keySpec); Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM); signature.initVerify(pubKey); signature.update(data); // 刮屬禰兆頁倦屎械 return signature.verify(decryptBASE64(sign)); } /** * 盾畜<br> * 喘暴埒盾畜 * * @param data * @param key * @return * @throws Exception */ public static byte[] decryptByPrivateKey(byte[] data, String key) throws Exception { // 斤畜埒盾畜 byte[] keyBytes = decryptBASE64(key); // 函誼暴埒 PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec); // 斤方象盾畜 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.DECRYPT_MODE, privateKey); return cipher.doFinal(data); } /** * 盾畜<br> * 喘暴埒盾畜 * * @param data * @param key * @return * @throws Exception */ public static byte[] decryptByPublicKey(byte[] data, String key) throws Exception { // 斤畜埒盾畜 byte[] keyBytes = decryptBASE64(key); // 函誼巷埒 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); |
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